Green Onyx Ring Green Onyx is associated with the planet Mercury, which is known to represent intelligence, elevated brain power, and enhanced memory. It is meant for anyone who wants to speak truth from the heart. This mineral opens up and actives the heart, in alignment to the brain, producing honesty and powerful realizations. *Green Onyx Oval 1 *10.5 Carat tw *16X12mm *Brass w/Platinum 18K YG Plating